The TowSmart Class III XMount Security Starter Kit has a Patented XMount Design that channels away moisture to minimize seizing within the aperture of the Receiver Hitch. The XMount design also includes a Lockrail system that allows you to torque the Hitch Ball with a Single Wrench. The Lockrail Functions as a "Built in Wrench" preventing the hitch ball rotation during installation or removal from the XMount Ball Mount. Single wrench ball installation, XMount fits 2" receivers and Includes 2" Ball & 5/8" locking pin. Meets J684 testing standards